The latest Retrievers novel is compulsively readable, fast paced and deadly
serious. The lighthearted tone of prior volumes is almost totally gone, and it's
a fitting change, as the stakes are so much higher. Wren continues to be an engaging and likable protagonist, one the reader can root for with all her heart.
As a distraction, Wren takes what should be a simple retrieval and it goes horribly wrong. She realizes that it's time to use her natural sneakiness to its full advantage and end the war once and for all. Whether or not Wren can do it and stay completely sane, however, is something else entirely. (Luna, May, 352 pp., $14.95)